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diff --git a/vendor/symfony/dependency-injection/Loader/Configurator/ContainerConfigurator.php b/vendor/symfony/dependency-injection/Loader/Configurator/ContainerConfigurator.php
new file mode 100644
index 000000000..a68f83d8f
--- /dev/null
+++ b/vendor/symfony/dependency-injection/Loader/Configurator/ContainerConfigurator.php
@@ -0,0 +1,141 @@
+<?php
+
+/*
+ * This file is part of the Symfony package.
+ *
+ * (c) Fabien Potencier <fabien@symfony.com>
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+
+namespace Symfony\Component\DependencyInjection\Loader\Configurator;
+
+use Symfony\Component\DependencyInjection\Argument\IteratorArgument;
+use Symfony\Component\DependencyInjection\Argument\TaggedIteratorArgument;
+use Symfony\Component\DependencyInjection\ContainerBuilder;
+use Symfony\Component\DependencyInjection\Definition;
+use Symfony\Component\DependencyInjection\Exception\InvalidArgumentException;
+use Symfony\Component\DependencyInjection\Loader\PhpFileLoader;
+use Symfony\Component\ExpressionLanguage\Expression;
+
+/**
+ * @author Nicolas Grekas <p@tchwork.com>
+ */
+class ContainerConfigurator extends AbstractConfigurator
+{
+    const FACTORY = 'container';
+
+    private $container;
+    private $loader;
+    private $instanceof;
+    private $path;
+    private $file;
+
+    public function __construct(ContainerBuilder $container, PhpFileLoader $loader, array &$instanceof, $path, $file)
+    {
+        $this->container = $container;
+        $this->loader = $loader;
+        $this->instanceof = &$instanceof;
+        $this->path = $path;
+        $this->file = $file;
+    }
+
+    final public function extension($namespace, array $config)
+    {
+        if (!$this->container->hasExtension($namespace)) {
+            $extensions = array_filter(array_map(function ($ext) { return $ext->getAlias(); }, $this->container->getExtensions()));
+            throw new InvalidArgumentException(sprintf(
+                'There is no extension able to load the configuration for "%s" (in %s). Looked for namespace "%s", found %s',
+                $namespace,
+                $this->file,
+                $namespace,
+                $extensions ? sprintf('"%s"', implode('", "', $extensions)) : 'none'
+            ));
+        }
+
+        $this->container->loadFromExtension($namespace, static::processValue($config));
+    }
+
+    final public function import($resource, $type = null, $ignoreErrors = false)
+    {
+        $this->loader->setCurrentDir(dirname($this->path));
+        $this->loader->import($resource, $type, $ignoreErrors, $this->file);
+    }
+
+    /**
+     * @return ParametersConfigurator
+     */
+    final public function parameters()
+    {
+        return new ParametersConfigurator($this->container);
+    }
+
+    /**
+     * @return ServicesConfigurator
+     */
+    final public function services()
+    {
+        return new ServicesConfigurator($this->container, $this->loader, $this->instanceof);
+    }
+}
+
+/**
+ * Creates a service reference.
+ *
+ * @param string $id
+ *
+ * @return ReferenceConfigurator
+ */
+function ref($id)
+{
+    return new ReferenceConfigurator($id);
+}
+
+/**
+ * Creates an inline service.
+ *
+ * @param string|null $class
+ *
+ * @return InlineServiceConfigurator
+ */
+function inline($class = null)
+{
+    return new InlineServiceConfigurator(new Definition($class));
+}
+
+/**
+ * Creates a lazy iterator.
+ *
+ * @param ReferenceConfigurator[] $values
+ *
+ * @return IteratorArgument
+ */
+function iterator(array $values)
+{
+    return new IteratorArgument(AbstractConfigurator::processValue($values, true));
+}
+
+/**
+ * Creates a lazy iterator by tag name.
+ *
+ * @param string $tag
+ *
+ * @return TaggedIteratorArgument
+ */
+function tagged($tag)
+{
+    return new TaggedIteratorArgument($tag);
+}
+
+/**
+ * Creates an expression.
+ *
+ * @param string $expression an expression
+ *
+ * @return Expression
+ */
+function expr($expression)
+{
+    return new Expression($expression);
+}